/* SPDX-License-Identifier: BSD-3-Clause */
/*
 * Authors: Yuri Volchkov <yuri.volchkov@neclab.eu>
 *
 *
 * Copyright (c) 2018, NEC Europe Ltd., NEC Corporation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "vfs.h"

#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <uk/print.h>
#include <uk/assert.h>
#include <vfscore/file.h>
#include <vfscore/eventpoll.h>

int fdrop(struct vfscore_file *fp)
{
	int prev;

	UK_ASSERT(fp);
	UK_ASSERT(fp->f_count > 0);

	prev = uk_dec(&fp->f_count);

	if (prev == 0)
		UK_CRASH("Unbalanced fhold/fdrop");

	if (prev == 1) {
		eventpoll_notify_close(fp);

		/*
		 * we free the file even in case of an error
		 * so release the dentry too
		 */
		if (vfs_close(fp) != 0)
			drele(fp->f_dentry);

		free(fp);

		return 1;
	}

	return 0;
}
void fhold(struct vfscore_file *fp)
{
	uk_inc(&fp->f_count);
}
